Compilation with winegcc and linking with msvcrt

[Ruslan Kabatsayev]

Hello all,

I'm trying to compile a simple application like follows with winegcc,
linking to msvcrt (which this test doesn't require, but it's a reduced
test case):

#include <stdio.h>
int main()
{
    printf("Hello");
    fflush(stdout);
    printf(", world!\n");
    return 0;
}

I compile it with this command:
winegcc test.c -o test -lmsvcrt

Looks pretty harmless, but when I run it, it only prints "Hello" and
hangs on fflush. If I don't link it to msvcrt, then it doesn't hang.
Why is it so? Is it a bug in Wine?

Regards,
Ruslan

[Alex Henrie]

2016-08-18 14:10 GMT-06:00 Ruslan Kabatsayev :
> Hello all,
>
> I'm trying to compile a simple application like follows with winegcc,
> linking to msvcrt (which this test doesn't require, but it's a reduced
> test case):
>
> #include <stdio.h>
> int main()
> {
>     printf("Hello");
>     fflush(stdout);
>     printf(", world!\n");
>     return 0;
> }
>
> I compile it with this command:
> winegcc test.c -o test -lmsvcrt
>
> Looks pretty harmless, but when I run it, it only prints "Hello" and
> hangs on fflush. If I don't link it to msvcrt, then it doesn't hang.
> Why is it so? Is it a bug in Wine?
>
> Regards,
> Ruslan

It's probably a conflict between msvcrt and glibc. The winegcc
documentation states that the -mno-cygwin flag "is necessary for the
vast majority of Win32 applications, as they typically depend on
various features of MSVCRT".[1] You could also compile your program as
an actual Windows EXE with `x86_64-w64-mingw32-cc test.c -o test.exe`.

-Alex

[Alex Henrie]

[1] https://www.winehq.org/docs/winegcc

[Ruslan Kabatsayev]

On Fri, Aug 19, 2016 at 1:16 PM, Alex Henrie  wrote:
> 2016-08-18 14:10 GMT-06:00 Ruslan Kabatsayev :
> > Hello all,
> >
> > I'm trying to compile a simple application like follows with winegcc,
> > linking to msvcrt (which this test doesn't require, but it's a reduced
> > test case):
> >
> > #include <stdio.h>
> > int main()
> > {
> >     printf("Hello");
> >     fflush(stdout);
> >     printf(", world!\n");
> >     return 0;
> > }
> >
> > I compile it with this command:
> > winegcc test.c -o test -lmsvcrt
> >
> > Looks pretty harmless, but when I run it, it only prints "Hello" and
> > hangs on fflush. If I don't link it to msvcrt, then it doesn't hang.
> > Why is it so? Is it a bug in Wine?
> >
> > Regards,
> > Ruslan
>
> It's probably a conflict between msvcrt and glibc. The winegcc
> documentation states that the -mno-cygwin flag "is necessary for the
> vast majority of Win32 applications, as they typically depend on
> various features of MSVCRT".[1] You could also compile your program as
> an actual Windows EXE with `x86_64-w64-mingw32-cc test.c -o test.exe`.

So I was actually linking against both msvcrt and glibc, right? This
then explains everything, thanks. Replacing -lmsvcrt with -mno-cygwin
fixes the issue.